[Nml-wg] New version of the schema document

[John Vollbrecht]

I have some comments on the schema -  I talked a bit with Jeroen about  
these since he is in AA this month.  I like the schema and that it is  
defining things so they can be discussed.  I particularly like the  
definition of adaptation as being between ports at different layers -  
this explains it for me and implies that adaptation takes place  
between ports at different layers of the same device.

I have other comments -

1) Jeroen says that there will be an introduction, and that it will  
define network- I just mention this.
2) I think that  level should be a top level element.  I think the  
reason it isn't there is that there was some confusion about whether  
the initial schema would be single or multiple level.
3) Subnet - the concept from G.800, 805 and 8080 should be included.   
Perhaps as a top level element or as a special group - I am not sure.
4) Ports should have relationship with groups, especially with  
subnetworks.  They also have relationship with layer.
5) I think that there could be virtual ports similar to virtual nodes,  
so an implemented by relation would be appropriate.  Jeroen may write  
this up more, but 8080 show virtual ports (SNPPs) and IDCs implement  
multiple next hops using VLAN groups on some edge ports.

some smaller points -
6) I think link capacity should not be the only attribute in the  
schema.  Perhaps something like "A Link MAY have additional attributes  
describing the performance, ownership, policy".   A separate sentence  
might say that attributes that describe throughput MUST be in bytes  
per second rather than bits per second.

7) Link definition seems circular when describing it as a link :)

John


On Aug 21, 2009, at 3:55 PM, Jeroen van der Ham wrote:

> Hello,
>
> I've just submitted a new revision of the schema document to the  
> subversion repository. Here's the changelog:
>
> - Added a short description of the Location and Lifetime objects
> - Added a section enumerating all Relations. I've not called them  
> "Relations" throughout the text.
> If need be, we can always make the names of Relations implicit in  
> the syntax.
> - Added a section on Service, describing the way we currently see  
> adaptations? I welcome comments!
> - The group section probably needs more work.
>
> I've updated the UML schema diagram to the latest version. I've also  
> added a note saying that this is not intended as endorsement or  
> finalizing, merely trying to reflect the current status.
>
> - Changed the Link group to Bidirectional Link as per the diagram.
>
>
> The latest version of the PDF can be found in the subversion  
> repository. Unfortunately the web access to it seems broken at the  
> moment, so I'm attaching it to this mail.
>
> Jeroen.
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